Method of making diamond dies



A. SIMONS.

METHOD OF MAKING DIAMOND DIES.

P FILED NOV. 30 1921.

IN V E N TOR Patentd June 20, 1922.

ABRAHAM SIMONS, or new Yomr, N. Y.

' METHOD OF MAKING DIAMOND DIES.

Original annlication filed December ber 30, 1921.

To all whom it may concern Be it known that I, ABRAHAM SIMoNs, a citizen,of Russia, residing at New York city, in the county of New York and State of New York, have invented certain new anduseful Improvements in Methods of Making- Diamond Dies,'of which the following is a specification.

My invention relates to a new and im proved diamond die and a method of manufacturing the same.

Diamond dies have been heretofore largely die is constructed in such a manner that a strong internal pressure, at right anglesto the axis of the bore, is produced and this internal, pressure counterbalances the outward disruptive force caused by the drawing of the wire.

This enables 7 since the diamond is reinforced by the pressure of" the surrounding metal} Another object of my invention is toproe .duce a diamond die in which the diamond is very firmly supported by the rigid 'metal enclosing it so that any relative movement of the diamond is prevented as such movement no matter how slight often produces the fracture thereof. I 7

Other objects of my invention will be disclosed in the following description and drawings which illustrate" a preferred embodiment thereof. v

Fig. 1 is a sectional View and illustrates the beginning of the manufacture of the diamond plug. I Fig. 2 is also a vertical sectional view which illustrates the next step in the manufacture of the die. t

Fig. 3 is a vertical sectional view which shows how the plug of the dieis finally formed. Y

Fig. 4 is a vertical sectional view showing the. completed die.

' Fig. 5 is avertical sectional view illustrate ing another method of making my improved die.

According to the first embodiment of my invention, the diamond 1 is placed 1n a metal the use of a small diamond,

Specification of Letters Patent. I Patented J 20 1922 9, 1920, Serial No. 429,415; Divided and this application filed Novem- Serial No. 518,744.

rod 2 having a recess 8 which is enclosed by a ti htly fitting plug 4.

T e rec'ess 3 may be filled with an inert gas such as nitrogen, before the plug 4 is inserted, but the amount of oxygen present in the recess 3 is so slight that in practice it can be ignored.

As'can'be seen in Fig. 1, the rod 2 is provided with a tapering conical portion 5 and a long neck portion 6 extending therefrom.

Afterthe plug 4; has been put into position, the rod 2 is heated adjacent the diamond 1 until the metal thereof becomes hot and quite plastic.

The rod 2 is then forced into the opening ofthe die 7,'which has a conical face 8 of a greater taper than the conical portion 5, and a long internal recess 9 which corresponds in shape to the neck 6.v I

Ordinarily, if the heating of the metal rod 2 before mentioned, is not very carefully regulated, then the interior ofthe recess 3 and theexterior of the diamond 1 become covered with films of oxide and even though these films are very thin, they prevent the diamond from being held j with sufficient tightness for the purpose for which it is intended, as this film or scale of oxide is of course very much weaker than the metal of the rod 2. However, by the use of the pre-' cautions above mentioned. theformation of any film or scale ofoxide is absolutely prevented. When the hot andplastic metal of the rod "2 has been forced under great pressure into the die 7, the result can 'be seen in Fig.2. As here shown, the metal of theneck 6 and of the conical portion 5 has. completely closed over and surrounded the diamond 1, so'that every-part of the diamond 1 abuts against the metal of the rod 2, without any intervening film of oxide, so that the diamond is held with absolute rigidity and firmness.

As can be seen-in Fig. 2, the metal-above the diamond 1 is closed along the line of junc- 1 tion 9.

- The superfluous parts of the rod 2-,ar e now removed by any suitable mechanism, until a portion is left as shown in Fig. 3 and'from lines in Fig. 3. It will be seen that the taper of the plug 10 is first very slight, and is oppositely inclined to the taper of the this portion, a plug 10 having the diamond l therein is cut out as clearly shown in dotted whereas in the structure shown in 2, the

. line of junction 9 was at the/narrow end of the conical surface 5. j

The plug 10 is now placed in -a holder 11 by the following method:

The holder 11 is first heated until it ex-' pands so that the plug 10 can be forced.

into position without using verymuch pressure. I

The holder 11 is now allowed to slowly cool and it exerts a heavy pressure agalnst the plug 10 so as to very firmly compress the metal thereof against the diamond 1-.-

The plug 10 is made of aslittle width as possible, so that the material thereof shall not interpose too much resistance to the compression stresses caused by the cool-j ing of the holder 11, whereby the yielding the holder 11 will not fracture the diaq mond 1. A hole is now bored through the the use of heat to expand the holder.

plug 10 and the diamond 1, as shown in Fig.4, and it will be noted that this bore now removes the metal adjacent the line of junction 9. The bore in the diamond 1 is substantially cylindrical in the middle.

thereof, and then flares out at both ends,

into substantially parabolic curves, the entering end of the bore of the diamond being somewhat wider than the exit end as clearly shown in Fig. 4.

The diamond is now subjected to powerful compression stresses in a direction substantially at right angles to the axis of the bore therein, and these compression stresses neutralize the outward disruptive force produced when the wire is forced through.

To increase the compression effect produced-by the cooling of the holder 11, this holder is tapered adjacent the bore thereof, so that the periphery of the conical plug 10 is subjected to the action of a longer mass of metal.

If at any time the bore of the diamond 1 becomes enlarged by the use thereof, the plug 10 can be readily forced out of the holder 11, because of the tapering contour theo l'eof, and the diamond can beagain utilize In the embodiment shown in Fig. ii, the plug is inserted into the holder without As. in the other embodiments, the exterior of the plug 10 and the interior bore of-the holder 11 are carefully ground so as to have the same contour. The plug 10 is then placed into theIbore 11 as shown in F i 5 and the holder 11 is then placed in a liydraulic cylinder'12 which is closed oil is uniform in all directions so the plug is forced in without any unbalanced inter nal stresses which'would lead to the fracture of the diamond.

Of course, the amount of yield is very slight and it is to be understood that in actual practice, the exterior of the holder 11 wvill be sufliciently'spaced from the interior of the cylinder 12 to permit a slight outward yield thereof, although this is too small to be seen by the naked eye.,

I have shown a preferred embodiment of my invention, but it is clear that numerous changes and omissions can be'made in its details without departing from its spirit.

This application is a division of my application Serial No. 429,415 filed Dec. 9, 1920.

What I claim is. Y

1. A method of making a diamond die which consists in embedding a. diamond in a'metal plug, securing the said plug in a holder which exerts compressive force thereon, and then boring the plug and diamond in a direction at an angle to the line of the said compressive force.

2. In the art of making diamond dies, that step in the art which consists in subjecting the diamond to compressive force whose line of action is at an angle to the axis of the bore of the said diamond.

3. In the art of making a diamond die, those steps which consist in heating a holder containing a diamond, until the said metal is plastic while preventing the access of air so as to avoid all oxidizing action, enclosing the metal of the said rod around the diamond, so as to firmly support. all parts of the said diamond by the said metal, and then placing a portion of the said metal containing the diamond therein in a holder.

4. A method of making a diamond die which consists in closing a body of metal round a diamond so as to firmly support the said diamond and to leave a line of junction of the said metal adjacent the said diamond, removing a metal plug from the said material containing the said diamond, the

exterior of the said metal plug being tapered and the said line of junction being at the broad end of the said plug, securing the said metal plug in a holder and then boring ahole through the said plug and diamond.

.by means of a cap 14 against which the part of the holder-'11. The pressure of the 5. A method of forming a diamond die, that stepin the art which consists in formwhich consists in forcing a plug having a ing the bore in the diamond While it is slightly tapered contour into a holder havunder compressive strains. 10 ing a bore therein of similar contour, the I In testimony whereof I hereunto aflix my 5 said plug being so forced on the diamond signature.

by the pressure against it of a body of oil.

6. In the art of making a diamond die, ABRAHAM SIMONS. 

